How to add values to single empty column from local text file - sql

Question

I have table called customers with CustomerID,CompanyName,Address,Phone
Now we inserted a new column called Remarks which is empty or null
I have text file to bulk insert into the column using the view Remarkinsert with the following code
bulk insert HRRegion.dbo.Remarksinsert
From 'C:\Users\SMSTECHLNG50\Documents\remarks..txt'
with
(
FIELDTERMINATOR = ',',
ROWTERMINATOR = '\n'
)
GO
But its getting the error
Msg 515, Level 16, State 2, Line 9 Cannot insert the value NULL into
column 'CustomerID', table 'HRRegion.dbo.Customers'; column does not
allow nulls. INSERT fails. The statement has been terminated.

Answer 1

I think that also here, you can only insert a whole row or nothing.
If your customer table looks like this:
customer
custid|co_name |addr |phone |remarks
42|Laverda |Breganze, Italy |[phone] |(NULL)
43|Benelli |Pesaro, Italy |[phone] |(NULL)
44|Ural |Irbit, Russia |[phone]|(NULL)
45|Dnepr |Kiew, Ukraine |[phone] |(NULL)
46|Harley Davidson|Milwaukee, US |[phone] |(NULL)
47|Honda |Tokyo, Japan |[phone] |(NULL)
48|Moto Guzzi |Mandello del Lario, Italy|[phone] |(NULL)
49|Ducati |Bologna, Italy |[phone] |(NULL)
50|Norton |Birmingham, UK |[phone]|(NULL)
51|Matchless |Plumstead, London, UK |[phone]|(NULL)
52|Brough |Nottingham, UK |[phone]|(NULL)
(well, you add the remarks column using an ALTER TABLE ...), then, I would expect the file you mentioned with the remarks to look somewhat like this:
remarks
custid|remarks
42|built also tractors, closed now
43|first series 6-cylinder motorbike
44|old style sidecar rigs with modern engine
45|old style sidecar rigs, permanent two-wheel drive
46|the american classic
47|builders of the CB 750 four and the gold wing
48|famous for horizontal singles and 90° V twins
49|90° V twin bikes with lateral crankshaft
50|english classic, still alive
51|english classic, closed now
52|probably the finest motorcycles ever built
So, you would build a remarks_stg table:
CREATE TABLE remarks_stg (
custid SMALLINT NOT NULL
, remarks VARCHAR(50) NOT NULL
);
Then, you load just that staging table with the data file as described above - and, at least if have SQL Server 2008 and above, you use a MERGE statement to update the customer table:
MERGE customer t
USING stg_customer s
ON t.custid = s. custid
WHEN MATCHED THEN UPDATE SET
remarks = s.remarks
;